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Old 08-11-2012, 06:53 PM   #1
BreakfastBurrito
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Another P0171 P0174, help

Ok so my car idles a bit rough when I'm stopped, whether I'm in Park or in drive. I checked the big hose between MAF and intake manifold, I dont see any cracks. I cleaned the MAF with spray. Cleared the codes and they haven't come back on. It still has a slight rough idle. A few seconds after turning the car on the trottle will open to about 1500rpm then come back to idle, on it's own. I also noticed when I'm driving below 20 and coming to a stop it seems to do something similar and open the throttle a bit on its own. I did the DISA check I found on YouTube and seems ok. Ideas?
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Old 08-11-2012, 07:06 PM   #2
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Suggest you read the first 2 links below in my signature.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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Old 08-11-2012, 07:20 PM   #3
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I'm on a phone, 25 miles from home. I'll check it out when I get home. Thanks.
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Old 08-11-2012, 10:50 PM   #4
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I checked that link through the phone browser. I initially did a rattle test by disconnecting the plug. After checking your links I realized I didn't do a real check. I was going to remove the disa and it's stuck in there. It comes out about just past the o-ring. I pryed it a little and I could see true butterfly fell out of box part and won't let true disa come out. I put back until I can order the part. I'm hoping that's the problem. Thanks a lot your thread helped out a lot. I did wash out the MAF and put in a bottle of techron, seems to have helped. Ses hasnt come back after clearing it.
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Old 08-12-2012, 08:03 AM   #5
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Have you started the car since putting the disa back? If not, hold a bit on doing that.

I'm concerned that if your butterfly dropped when you were pulling it out, that maybe your pin broke (I think it did), and I know they fall out into the intake mani...which isn't a good thing.

I'm not sure how disa is put together so IDK for certain this happened, but think you should search a bit on this before driving the car.

Sorry...I was wrestling with whether to mention this and risk causing you grief, vs. the grief you'd have if I was right and didn't mention my concern.

I am guessing, but had to say something. Sorry again!
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Old 08-12-2012, 01:07 PM   #6
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Well I did drive on it. No problems. I would be stranded if I didn't. I'm going to get the part and do it tomorrow. Wish I had know earlier in the week so I could've done it today.
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Old 08-12-2012, 01:21 PM   #7
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Dmax is worried the rear DISA pin may come loose. Read about it in my first link. Not likely, but could happen & destroy your engine!
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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Old 08-12-2012, 02:22 PM   #8
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Yea I read about it. I hope it doesn't. Has I hold over till tomorrow. I have a Chevy 350 w a 350turbo tranny I could swap in.
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Old 08-13-2012, 05:28 AM   #9
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I think you 'should' swap in that Chevy engine just to hold you over until you get new disa. Might take a couple of extra parts, but I'm like 35% you could get it to work!

Please make thread about it!
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Old 08-13-2012, 06:04 AM   #10
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Jfoj i read your first line because I'm getting a problem that you listed! My car never went in idle but some time when i cruise around 50mph my check engine light come on with only P0174 and like 2 day it go away by itself! I check for leak and i dont have none since i'm buying every maintain part part of my car new and intake has already review i got new fuel pump and fuel filter! And i clean my MAF yesterday because of this but it looks clean! What should i check next?
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Old 08-13-2012, 06:08 AM   #11
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Air filter and intake/vac leaks.

What does "never went in idle" mean? You idle fine at 700 without any surging?
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Old 08-13-2012, 06:18 AM   #12
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I got new with almost 500miles K&N filter and i check vac lines for leaks but i didn't find any! What my car does is you are cruising normal at normal speed normal acceleration and check engine comes on with out any change that you feel everything keep going normal! That frustrate me! Because i got this since i got my ride! And i know they haven't take care of it because almost every part i have change were The original one fuel filter say 03-24-2001 so they never swich it and i start puting almost everything new!
But thanks for your comment! I will look for vac leaks again! Some specific area?
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Old 08-13-2012, 06:26 AM   #13
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Is your air filter oiled? If so, clean maf again...just with spray. Clean electric connection. Toss filter and use plain paper.

As far as air leaks...first, anyplace you've been recently. It's not unheard of that the intake boot goes on but doesn't seal (some have said the tab can get stuck in). CCV vent hose cracks. Oil filter cap/dipstick o-rings. If you've done vcg, then the sap valve hose which runs along exhaust side to back cracks pretty regularly.

DISA/TB has o-ring or gasket...leaks could be all over the place. That you only get it at speed makes me think it's when the car really wants a lot of air, so that it'd be a smallish crack you're looking for. LED light and inspection mirror. DIY smoke test with cigar?
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Old 08-13-2012, 06:39 AM   #14
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Sorry for my lack of knowledge but i didnt get most of the last part! I buy new intake boot both of then OEM problem still showing on my intake has no oil on it never put it! The DISA i haven't check it, will clean conector today after work, will check oil dipstick o-ring, no LED light at all in my ride, dont know what is smoke test cigar! Sorry, i think already that my problem is on DISA!? What you think
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Old 08-13-2012, 06:39 AM   #15
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If you are getting lean codes at 40+ MPH, it is likely your MAF and/or fuel delivery problem.

If it was my car, given fuel pumps are failing an leaving everyone stranded, I might be inclined to replace my fuel pump and filter first and see what happens, it is cheaper than a replacement MAF, then if that does not resolve the problem, I would consider replacing the MAF.

Depending on mileage, O2 sensor refresh may be helpful as well, I would only worry about the pre-Cat sensors for now. Amazon.com usually has Bosch sensors for under $50.

BMWparts.com for fuel pump & filter, check their MAF prices as well.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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Old 08-13-2012, 06:48 AM   #16
bimer21
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I got new so far on my ride:
Fuel filter
Fuel pump
4 O2 bosch sensor
Spark plug
Air filter
OEM both intake boots
Engine oil and filter (3k ago)
Coils are good!
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Old 08-13-2012, 06:54 AM   #17
jfoj
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So my next move would be a replacement MAF.

Sometimes you can have exhaust leaks letting air into the exhaust stream, however, when MAF's really soft fail, they under report the amount of air being brought into the engine and they the DME ends up running lean.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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Old 08-13-2012, 07:02 AM   #18
bimer21
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Well i clean it yesterday so let see how it came out it happen like 3-10 that i cruise at that speed exhaust maybe because i replace the disc flex and center shaft mount bearing and all shifter to a E39 one and i put new gaskets down there and of course make sure that were no leaks bcus i dont like that ugly sound! But i will recheck thanks
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Old 08-13-2012, 07:23 AM   #19
jfoj
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MAF cleaner does not resolve the problem with what really happens to a soft failing MAF. The hot wire oxides on the outside and the oxidation acts as insulation and causes the MAF to under report the airflow value. The MAF has circuity to combat the oxidation but over time it cannot do the job it needs to.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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Old 08-13-2012, 07:35 AM   #20
bimer21
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What you say is that i'm f...up right jajajaja i will clean connector today and if this doesnt work clean the DISA i guest and if continue will change MAF thanks for all your help guys!
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